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screen (Up, Ex, Re, Do, En, Me). If a key is pressed and held down, a blinking asterisk
(*) appears on the screen next to the key's abbreviation. If an asterisk does not appear
when a key is pressed and held down, it is probably because the key bounced when it
was pressed. In this case, press (and hold down) the key again.
NOTE
During normal operation, pressing and holding a key down results in automatic repeat
keystroke activity.
The blinking asterisk always appears next to the abbreviation for the key that was
pressed last. Example: If a key is pressed and held down, and then another key is
pressed and held down without releasing the first key, the first key's abbreviation
remains on the screen and the blinking asterisk appears next to the second key's ab-
breviation.
If one control key is pressed and held down, and then a second control key is pressed
and held down without releasing the first key, the blinking asterisk appears next to
the second key's abbreviation (as mentioned above). Then, if the first key is released,
its abbreviation and the blinking asterisk both disappear from the display.
When all keys are released, the bottom two lines of the Test Keyboard screen should
be blank, with the exception of the keystroke counter display in the lower-right corner
of the screen.
The keystroke counter display indicates the number of key presses that occur while
the Test Keyboard screen is in use. The keystroke count should increase by one and
only one number each time a control key is pressed. The keystroke count should not
increase while a key is held down or when a key is released. If the keystroke count
does increase while a key is held down, or when a key is released, a problem with a
control key switch or the keypad ground connection may exist. In this case, please re-
fer to Chapter 6 of this manual for additional troubleshooting information.
To exit the Test Keyboard screen and return to the Maintenance menu, press the EX-
IT and ENTER keys at the same time.
4-12
The Maintenance Menu
501510 Rev. S
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